Optimize cursor tracking with requestAnimationFrame

[youfuwang888-tech]

Summary

Optimizes the custom cursor tracking examples so pointer movement is batched through requestAnimationFrame instead of writing cursor positions directly during high-frequency mouse events.

Changes

• Keeps mousemove handlers focused on storing the latest coordinates.
• Moves cursor DOM writes into animation loops.
• Uses transform: translate3d(...) for cursor movement instead of left/top writes in the updated examples.
• Adds will-change: transform hints for the dot/ring elements.
• Preserves the existing hover behavior and cleanup pattern.

Verification

Static review of data/cursors.ts confirms the updated dot/ring examples no longer write dot.style.left or ring.style.left directly during mousemove handling.

Notes

This PR is scoped to cursor tracking performance. It does not add external services, authentication, wallet logic, or payment flows.

Closes #2

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